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SEQUOIA ANALYTICAL - -- <br /> 819 Striker Avenue Suite 8 • Sacramento CA 95834 <br /> (916) 921 9600 • FAX (916) 921-0100 <br /> Brown & Caldwell Client Project ID Arco 2133-93-5, Stockton <br /> 723 S St Matrix Water <br /> Sacramento, CA 95814 <br /> Attention Mindy Wright QC Sample Group 309-0404 Reported Sep 16, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Cadmium Chromium Copper Lead Nickel Zmc <br /> Method: EPA 200 7 EPA 200 7 EPA 200 7 EPA 200 7 EPA 200 7 EPA 200 7 <br /> Analyst: S Foster S Foster S Foster S Foster S Foster S Foster <br /> Concentration <br /> Spiked 0 10 mg/L 0 10 mg/L 0 10 mg/L 0 50 mg/L 0 20 mg/L 0 10 mg/L <br /> LCS Batch#: LCS091693 LCS091693 LCS091693 LCS091693 LCS091693 LCS091693 <br /> Date Prepared: 9/16/93 9/16/93 9/16/93 9/16/93 9/16/93 9/16/93 <br /> Date Analyzed: 9/16/93 9/16/93 9/16/93 9/16/93 9/16/93 9/16/93 <br /> Instrument I D.#- PE-40 PE-40 PE-40 PE-40 PE-40 PE-40 <br /> LCS % <br /> Recovery: 116 94 109 107 109 97 <br /> Control Limits: 60120 80-120 80-120 80-120 80-120 80-120 <br /> xH• r v v <br /> AAS/MSD <br /> Batch#: 3090406 3090405 3090406 3090406 3090406 3090406 <br /> Date Prepared: 9/16/93 9/16/93 9/16/93 9/16/93 9/16/93 9/16/93 <br /> Date Analyzed: 9/16/93 9/16/93 9/16/93 9/16/93 9/16/93 9/16/93 <br /> Instrument I D.#: PE-40 PE-40 PE-40 PE-40 PE-40 PE-40 <br /> Matrix Spike <br /> % Recovery: 101 100 105 98 101 98 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 91 90 95 89 90 86 <br /> Relative% <br /> Difference: 10 11 10 96 12 13 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> SEOUOIA ANALYTICAL preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> ` validation of sample batch results Due to matrix effects,the OC limits for MS/MSD's are advisory only <br /> , [ tl and are not used to accept or reject batch results <br /> Linda C Schneider <br /> , <br />